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Saki, A.. 2009. Protein pattern and urease activity of two types of soybean meal on protein digestibility and chicken performance. J. Appl. Anim. Res., 35: 45-48. The experiment was conducted on extracted (ES) and mechanical soybean meal (MS) in broiler chicken feeding. Three hundred fifty two day old Lohman chickens were placed in four treatments by 4 replicates with 22 chickens in each. Treatments included: 25 or 35% of E S or MS. Higher fiber, fat and gross energy content were obtained in M S than ES. Protein patterns observed by SDS-PAGE showed differences that indicated the specific proteins in E S compared with MS. M E , AMEn, TME and TMEn were reduced (p<0.05) in M S compared to ES. Feed intake was increased (p~0.05) in starter period (21 d) by ES treatments in comparison to MS treatments. Body weight was (P<0.05) higher in 25% ES in comparison to 25 and 35% M S in grower period (42 d). Feed conversion ratio was improued by 25% of ES compared with 35% of ES treatment (P<0.05) i n 21 d. Urease activity (UA) in E S was lower than in MS. It is concluded that ES, as compared to MS, improved broiler performance.

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